1,582 research outputs found
Zo kan het ook ......... en zo moet het
No full textAfscheidscollege, ter gelegenheid van het bereiken van de pensioengerechtigde leeftijd, op vrijdag 28 april 1989, door ir. W.A. Eisma.Building TechnologyArchitectur
Industrial applications of lasers
No full textThe advent of the laser has from the welding of retinas opened up many fields of to high-bit-rate information technology. The availability transmission. In this article, of a powerful and coherent the author reviews the source of controlled light present position and gives the designer a versatile possible future uses of the tool in applications ranging lase
The Effect Of Error Correcting Coding On Indoor Wireless Communications Systems In The 20 - 60 GHz Region
No full textAs a follow-up of the literature study ’An Overview Of Indoor Wireless Communications Systems In Ilie 20 - 60 GHz Region’, published by B.J. Bout jand W.A. Schouten in December 1992, a further study has been performed to investigate the effect of Forward Error Correcting Coding on Indoor Wireless Communications Systems. This has been done by calculating the average fade- and non-fade duration as a function of the frequency and the Signal To Noise ratio. These results are conveyed to a Bit Error Probability. After that, the same calculations are done for the same channel, but with Forward Error Correcting Coding.Electrical Engineering, Mathematics and Computer ScienceTelecommunicatie- en Verkeersbegeleidingssysteme
Hardwarekeuze voor het El Condor Soundsystem: Aanbevelingsrapport voor optimale hardware
No full textProfessionele muzikanten gaan naar een opnamestudio als ze een album willen opnemen van hoge geluidskwaliteit. Voor de beginnende muzikant zijn deze studio’s echter niet te betalen, aangezien een opname minstens \u801500 kost. Het aanschaffen van eigen opnameapparatuur is nog vele malen duurder. In die hoge prijs gaat het El Condor Soundsystem verandering brengen. Het El Condor Soundsystem is een draagbaar apparaat, dat een ruimteopname van gespeelde muziek vastlegt, bewerkt en opslaat als bestand dat leesbaar is op elke PC. Het El Condor Soundsystem kan dankzij zijn algoritmes verschillende bronnen onderscheiden zonder hier een fysieke verbinding mee te hebben. De verschillende geluidssporen worden gebruikt om de muziek automatisch te verfraaien en daarna worden deze weer gemixt tot één eindproduct met CD-kwaliteit. Voor het bewerken en wegschrijven is veel rekenkracht nodig. Daarom wordt in dit rapport antwoord gegeven op de vraag: met welke hardware kun je het El Condor Soundsystem zo efficiënt (en dus goedkoop) mogelijk implementeren?EEMicroelectronics & Computer EngineeringElectrical Engineering, Mathematics and Computer Scienc
Antoine Baumé et l'Académie Royale de Médecine de Madrid
No full textAntoine Baumé und die « Académie Royale de Médecine » von Madrid.
In Beantwortung einer offengelassenen Frage von P. Julien und R. Weitz in einem Artikel vom Jahre 1979, stellt der Verfasser fest dass Antoine Baumé (1728-1804) tatsächlich der « Académie Royale de Médecine » von Madrid angehörte : als Mitglied erwahlt sehr wahrscheinlich zwischen Oktober 1775 und Juni 1776, blieb er dies zweifellos bis zu seinem Tod.Antoine Baumé and the Royal Academy of Medicine of Madrid.
In response to a question left in suspense by P. Julien and R. Weitz in a 1979 article, the author shows that Antoine Baumé (1728-1804) had effectively belonged to the Royal Academy of Medicine of Madrid : elected corresponding member of this Academy quite probably between October 1775 and June 1776, he remained one undoubtedly until his death.Smeaton W.A. Antoine Baumé et l'Académie Royale de Médecine de Madrid. In: Revue d'histoire de la pharmacie, 72ᵉ année, n°263, 1984. pp. 397-400
Flexibele oledverlichting klaar voor de markt
No full textOnderzoekers van Holst Centre en Fraunhofer FEB produceerden eind 2018 een oled-rol van 15 meter; ‘s werelds langste verlichtingsdevice uit 1 stuk. Pim Groen, professor aan de TU Delft en projectleider Large Area Printing bij Holst Centremarkeert deze prestatie als een absolute gamechanger. ‘We hebben nu aangetoond dat opschaling naar continu-productie mogelijk is. Daarmee is de weg vrijgemaakt voor de definitieve doorbraak van een revolutionaire lichtbron.’Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Novel Aerospace Material
Research Note: On the error behaviour of force and moment sources in simplicial spectral finite elements
No full textThe representation of a force or moment point source in a spectral finite-element code for modelling elastic wave propagation becomes fundamentally different in degenerate cases where the source is located on the boundary of an element. This difference is related to the fact that the finite-element basis functions are continuous across element boundaries, but their derivatives are not. A method is presented that effectively deals with this problem. Tests on one-dimensional elements show that the numerical errors for a force source follow the expected convergence rate in terms of the element size, apart from isolated cases where superconvergence occurs. For a moment source, the method also converges but one order of accuracy is lost, probably because of the reduced regularity of the problem. Numerical tests in three dimensions on continuous mass-lumped tetrahedral elements show a similar error behaviour as in the one-dimensional case, although in three dimensions the loss of accuracy for the moment source is not a severe as a full order.Accepted Author ManuscriptApplied Geophysics and Petrophysic
Structured design of an external NMOS based linear voltage regulator for automotive applications
No full textThe electronization of automobiles is considered to be a revolution in automotive technology development progress. System level integrated circuits are needed to simplify the automotive electronics design and increase the reliability of automobiles. In this thesis, a prototype of a linear voltage regulator is designed for system level integration. Instead of a conventional Internal PMOS or NMOS linear regulator topology, an external NMOS transistor produced by NXP is chosen as the pass device on considerations of certain commercial application. The parasitic inductance and capacitors of PCB traces and packaging are both modeled and calculated. The requirement differences of internal and external NMOS linear regulators are compared. This external NMOS transistor complicates the high-frequency design of this voltage regulator. The development of frequency compensation strategies as well as their implementation is the core of this work. Based on transistor models made by the author and the Root-Locus analysis method, the effectiveness of conceptual active compensation is examined in this thesis, and a passive frequency compensation scheme is proposed. This proposed scheme is not only able to accommodate the wide variation of load capacitor (470nF to 47μF) and the wide variation of load current (0 to 250mA) but also able to be compatible with the external NMOS. The effectiveness of passive frequency compensation is examined by both Root Locus analysis and transistor level simulation. The over-current protection of the NMOS linear regulator is also designed, which is realized by applying another current regulation loop to the voltage regulator. This voltage regulator is able to maintain a constant output current around 400mA in over-current protection scenario. The regulator quiescent current is 10μA, the output voltage accuracy is ±2%. At the end of this thesis, the performance aspects are discussed and analyzed, and the influence of parasitic PCB trace and packaging is examined.Electrical Engineering, Mathematics and Computer ScienceMicroelectronic
Soil and water management strategies for tidal lowlands in Indonesia
No full textAbstract not availableCivil Engineering and Geoscience
Some aspects of the design and operation of water management systems
No full textThis study deals with the design of water management systems. Attention is focused on that phase in the design process in which variants are developed and evaluated with emphasis on the evaluation. The proposed evaluation procedure combines an economic evaluation with an evaluation of the hydraulic qualities- The economic evaluation implicates the determination of the internal rate of return but reduces to the determination of the net present value of the cost if no agricultural production level can be defined- The evaluation of the hydraulic qualities involves the steady and non-steady design criteria for various land uses or for various return periods. The evaluation is presented in a balance sheet where the economic evaluation can be balanced against the degree to which the design fulfils the design criteria. This enables the designer to develop various variants while evaluating. An example of the application of the procedure is given- In search of a method to determine a nominal agricultural production level which is related to the water management scenario, a model was developed where all aspects related to crop yield were included on the condition that nutrient supply is optimal. All aspects include workability, crop development, harvest conditions etc. This model makes it possible to quantify the effect of different water management scenarios on crop yield. Two examples are presented where the model is appliedCivil Engineering and Geoscience
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